Leroy-Somer LSA 49.1 4P Instruction Manual

This manual is to be given to
the end user
LSA 49.1 4P
ALTERNATORS
Installation and maintenance
3007 en - 11.2004 / e
53

2
INSTALLATION AND MAINTENANCE
LSA 49.1 4P
ALTERNATORS
3007 en - 11.2004 / e
LEROY-SOMER
This manual concerns the alternator which
you have just purchased.
The latest addition to a whole new generation
of alternators, this range benefits from the
experience of the leading manufacturer
worldwide, using advanced technology and
incorporating strict quality control.
SAFETY MEASURES
Before using your machine for the first time, it is important to
read the whole of this installation and maintenance manual.
All necessary operations and interventions on this machine
must be performed by a qualified technician.
Our technical support service will be pleased to provide any
additional information you may require.
The various operations described in this manual are
accompanied by recommendations or symbols to alert the
user to potential risks of accidents. It is vital that you
understand and take notice of the following warning symbols.
Warning symbol for an operation capable of damaging or
destroying the machine or surrounding equipment.
Warning symbol for general danger to personnel.
Warning symbol for electrical danger to personnel.
Note: LEROY-SOMER reserves the right to modify the
characteristics of its products at any time in order to
incorporate the latest technological developments. The
information contained in this document may therefore be
changed without notice.
We wish to draw your attention to the contents
of this maintenance manual. By following
certain important points during installation,
use and servicing of your alternator, you can
look forward to many years of trouble-free
operation.
WARNING SYMBOLS
A set of self-adhesive stickers depicting the various warning
symbols is included with this maintenance manual. They
should be positioned as shown in the drawing below once the
machine has been fully installed.
Copyright 2004 : MOTEURS LEROY-SOMER
This document is the property of :
MOTEURS LEROY-SOMER
It may not be reproduced in any form without prior
authorization.
All brands and models have been registered and patents
applied for.
WARNING
WARNING

3
INSTALLATION AND MAINTENANCE
LSA 49.1 4P
ALTERNATORS
CONTENTS
3007 en - 11.2004 / e
LEROY-SOMER
1 - RECEIPT
1.1 - Standards and safety measures ....................4
1.2 - Inspection ......................................................4
1.3 - Identification...................................................4
1.4 - Storage ..........................................................4
2 - TECHNICAL CHARACTERISTICS
2.1 - Electrical characteristics ................................5
2.2 - Mechanical characteristics.............................5
2.3 - Excitation system...........................................6
3 - INSTALLATION
3.1 - Assembly .......................................................8
3.2 - Inspection prior to first use.............................8
3.3 - Terminal connection diagrams.......................9
3.4 - Commissioning ............................................11
3.5 - Settings........................................................11
4 - SERVICING - MAINTENANCE
4.1 - Safety measures......................................... 14
4.2 - Regular maintenance.................................. 14
4.3 - Fault detection ............................................ 14
4.4 - Mechanical defects ..................................... 15
4.5 - Electrical faults............................................ 15
4.6 - Dismantling, reassembly............................. 17
4.7 - Installation and maintenance of the PMG... 19
4.8 - Table of characteristics............................... 19
5 - SPARE PARTS
5.1 - First maintenance parts .............................. 20
5.2 - Technical support service ........................... 20
5.3 - Accessories................................................. 20
5.4 - Exploded view, parts list ............................. 21

4
INSTALLATION AND MAINTENANCE
LSA 49.1 4P
ALTERNATORS
RECEIPT
3007 en - 11.2004 / e
LEROY-SOMER
1 - RECEIPT
1.1 - Standards and safety measures
Our alternators comply with most international standards and
are compatible with :
- the recommendations of the
International Electrotechnical Commission
IEC 34-1, (EN 60034).
- the recommendations of the
International Standards Organisation ISO 8528.
- the European Community directive 89/336/EEC on
Electromagnetic Compatibility (EMC).
- the European Community directives
73/23/EEC and 93/68/EEC (Low Voltage Directive).
They are CE marked with regard to the LVD (Low Voltage
Directive) in their role as a machine component. A declaration
of incorporation can be supplied on request.
Before using your generator for the first time, read carefully
the contents of this installation and maintenance manual,
supplied with the machine. All operations performed on the
generator should be undertaken by qualified personnel with
specialist training in the commissioning, servicing and
maintenance of electrical and mechanical machinery. This
maintenance manual should be retained for the whole of the
machine’s life and be handed over with the contractual file.
The various operations described in this manual are
accompanied by recommendations or symbols to alert the
user to potential risks of accidents. It is vital that you
understand and take notice of the different warning symbols
used.
1.2 - Inspection
On receipt of your alternator, check that it has not suffered
any damage in transit. If there are obvious signs of knocks,
contact the transporter (you may able to claim on their
insurance) and after a visual check, turn the machine by hand
to detect any malfunction.
1.3 - Identification
The alternator is identified by means of a nameplate glued to
the frame.
Make sure that the nameplate on the machine conforms to
your order.
The machine name is defined according to various criteria
(see below).
Example of description for : LSA 49.1 M6 C6/4 -
• LSA : name used in the PARTNER range
M : Marine / C : Cogeneration / T : Telecommunications.
• 49.1 : machine type
• M6 : model
• C : Excitation system (C: AREP / J: SHUNT+ PMG /
E: COMPOUND)
• 6/4 : winding number / number of poles.
1.3.1 - Nameplate
So that you can identify your machine quickly and accurately,
we suggest you fill in its specifications on the nameplate
below.
1.4 - Storage
Prior to commissioning, machines should be stored :
- Away from humidity : in conditions of relative humidity of
more than 90%, the machine insulation can drop very rapidly,
to just above zero at around 100%; monitor the state of the
anti-rust protection on unpainted parts.
For storage over an extended period, the machine can be
placed in a sealed enclosure (heatshrunk plastic for example)
with dehydrating sachets inside, away from significant and
frequent variations in temperature to avoid the risk of
condensation during storage.
- If the area is affected by vibration, try to reduce the effect of
these vibrations by placing the generator on a damper
support (rubber disc or similar) and turn the rotor a fraction of
a turn once a fortnight to avoid marking the bearing rings.
ALTERNATEURS ALTERNATORS
Valeurs excit / Excit. values
en charge / full load
à vide / at no load
Made by Leroy Somer - 1 024 930/b
Tension
Voltage
Secours
Std by
40C
27C
PUISSANCE / RATING
Conforme à C.E.I 34-1(1994). According to I.E.C 34-1(1994).
LR 0021
Connex.
kVA
kW
A
kVA
kW
A
V
Ph.
Continue
Continuous
LSA Date
N Hz
Min
-1
/R.P.M. Protection
Cos Ø /P.F. Cl. ther. / Th. class
Régulateur/A.V.R.
Altit. m Masse / Weight
Rlt AV/D.E bearing
Rlt AR/N.D.E bearing
Graisse / Grease

5
INSTALLATION AND MAINTENANCE
LSA 49.1 4P
ALTERNATORS
TECHNICAL CHARACTERISTICS
3007 en - 11.2004 / e
LEROY-SOMER
T1 T2 T3
T4 T5 T6
Surge suppressor
5+ 6-
T7 T8 T9
T10 T11 T12
R 448
Aux. windings
STATOR : 12 wires (marked T1 to T 12)
Exciter
Field
Armature
MAIN FIELD
Voltage reference
STATOR : 6 wires (marked T1 to T6)
T1 T2 T3
T4 T5 T6
Surge suppressor
5+ 6-
T7 T8 T9
T10 T11 T12
R 448
PMG
STATOR : 12 wires (marked T1 to T 12)
Exciter
Field
Armature
MAIN FIELD
Voltage reference
STATOR : 6 wires (marked T1 to T 6)
2 - TECHNICAL
CHARACTERISTICS
2.1 - Electrical characteristics
PARTNER LSA 49.1 alternators are machines without
sliprings or revolving field brushes, wound as "2/3 pitch"; 6 or
12-wire, with class H insulation and a field excitation system
available in either AREP or "SHUNT+PMG" version (see
diagrams).
AREP
system
with R 448
SHUNT
+
PMG
system
with R 448
Interference suppression conforms to standard EN 55011,
group 1, class B.
2.1.1 - Options
- Stator temperature sensors
- Space heaters
- Terminal box with bus bar terminals for mounting protection
or measurement C.T.
2.2 - Mechanical characteristics
- Steel frame
- End shields in cast iron
- Greasable ball bearings
- Mounting arrangement
IM 1201 (MD 35) :
Single bearing with feet and SAE flanges/coupling discs.
IM 1001 (B 34) :
Two-bearing with SAE flange and standard cylindrical shaft
extension.
- Drip-proof machine, self-cooled
- Degree of protection : IP 23
2.2.1 - Options
- Protection against harsh environments
- Air inlet filter, air outlet labyrinth seals : IP 44.
To prevent excessive temperature rise caused by clogged
filters, it is advisable to monitor the stator winding with thermal
sensors (PTC or PT100).
- Bearing detection sensors

6
INSTALLATION AND MAINTENANCE
LSA 49.1 4P
ALTERNATORS
TECHNICAL CHARACTERISTICS
3007 en - 11.2004 / e
LEROY-SOMER
2.3 - Excitation system
For both AREP & PMG excitation systems, the alternator
voltage regulator is the R 448.
With AREP excitation, the R 448 electronic AVR is powered
by two auxiliary windings which are independent of the
voltage match circuit. The first winding has a
voltage in
proportion to that of the alternator (characteristic
Shunt), the second has a voltage in proportion to the stator
current (compound characteristic: Booster effect). The power
supply voltage is rectified and filtered before being used by
the AVR monitoring transistor.
With PMG excitation, a permanent magnet generator (PMG)
added to the alternator
supplies the AVR with voltage which is
independent
of the main alternator winding. This is fitted at the
rear of the machine and connected
to the R 448 AVR, and the
ST9 jumper must be disconnected
.
These two principles provide the machine with a short-circuit
current capacity of 3 IN for 10 s, and good immunity
to
distortions generated by the load.
The AVR monitors and corrects the alternator output voltage
by adjusting the excitation current.
2.3.1 - R 448 AVR
- Shunt power supply: max 150V - 50/60 Hz
- Rated overload current: 10A - 10s
- Electronic protection: (in the event of overload, short-circuit,
loss of voltage sensing) this acts to restore the value of the
excitation current to 1A after 10 s. The alternator must be
stopped (or the power switched off, see section 3.5.3) in order
to reset the protection.
- Fuse: F1 on X1, X2
- Voltage sensing : 5 VA isolated via transformer
• 0-110 V terminals = 95 to 140 V
• 0-220 V terminals = 170 to 260 V
• 0-380 V terminals = 340 to 520 V
for other voltages, a transformer should be used.
- Voltage regulation ± 0.5%
- Normal or rapid response time via jumper ST2
- Voltage adjustment via potentiometer P2 or apply a DC
voltage of ± 1 V on the terminals of the external potentiometer
- Current sensing: (parallel operation): input S1, S2 intended
for 1 C.T.
≥ 2.5 VA cl1, secondary 1A (optional)
- Quadrature droop adjustment via potentiometer P1
- Max. excitation current adjustment via P5 : 4.5 to 10A
- 50/60 Hz selection via ST3 jumper
- ST11 : Knee-point at 65 Hz for Tractelec application and
variable speed.
2.3.2 - Power supply connection
2.3.3 - Frequency compared with voltage
(without LAM)
Power supply
(see 2.3.2)
4 x holes Ø 5.8 x
175 x 115 mm
200 x 140 mm
X2
X1
Z2
E+
E-
0V
110
220
380
Z1
L2(V)
L3
(W)
340-520V
170-260V
P2
P3
ST2
ST11
R731
T.I.
ST4
Option
Option
Option S1 S2
P1
ST1
ST6
normal
knee-point:
65 Hz
open
46.2
47.1
49.1
P5
Field
5+ 6 -
95-140V
AREP
PMG
ST9
ST10
15 %
25 %
Frequency
ST3
50Hz 60Hz
ST5
with
LAM
w/o
LAM
LAM
LAM
External potentiometer
for adjusting the voltage
3-ph. detection
Single-
phase
detection
Voltage
Stability
Quad droop
Excitation
ceiling
Slow
fuse
250V 10 A
fast
Response
time
F1
AREP
X2
Z1
X1
Z2
E+
E -
Auxiliary
wind.
Yellow
Red
Green
Black
5 + 6 -
Exciter field
PMG
X2
Z1
X1
Z2
E+
E -
5 + 6 -
Exciter field
14
15
16
PMG
100 %
50 Hz 60 Hz Hz
50 Hz
48 Hz
57.5 Hz
60 Hz
Voltage Bend
U/UN
Frequency

7
INSTALLATION AND MAINTENANCE
LSA 49.1 4P
ALTERNATORS
TECHNICAL CHARACTERISTICS
3007 en - 11.2004 / e
LEROY-SOMER
2.3.4 - LAM (Load Acceptance Module)
characteristics
The LAM system is integrated in the regulator, as standard it
is active (ST5 with bridge). It can be deactivated by removing
the ST5 bridge. It can be adjusted to 13% or 25% by means
of the ST10 jumper.
- Role of the “LAM” (Load Acceptance Module):
On application of a load, the rotation speed of the generator
set decreases. When it passes below the preset frequency
threshold, the LAM causes the voltage to drop by
approximately 13% or 25% and consequently the amount of
active load applied is reduced by approximately 25% to 45%,
until the speed reaches its rated value again.
Hence the LAM can be used either to reduce the speed
variation (frequency) and its duration for a given applied load,
or to increase the applied load possible for one speed
variation (turbo-charged engine).
To avoid voltage oscillations, the trip threshold
for the LAM function should be set approximately 2 Hz below
the lowest frequency in steady state. It is advisable to use the
LAM at 25% for load impacts
≥ 70% of the genset rated
power.
2.3.5 - Typical effects of the LAM with a diesel
engine with or without a LAM (U/F only).
2.3.5.1 - Voltage
2.3.5.2 - Frequency
2.3.5.3 - Power
2.3.6 - Gradual voltage return function
During load impacts, the function helps the genset to return to
its rated speed faster thanks to a gradual increase in voltage
according to the principle:
- If the speed drops between 46 and 50 Hz, the rated voltage
follows a fast gradient as it is restored.
- If the speed drops below 46 Hz, since the engine needs
more help, the voltage follows a slow gradient as it returns to
the reference value.
2.3.7 - R 448 AVR options
- Current transformer for parallel operation
of....../ 1A
≥ 2.5 VA CL 1 (See the diagram in this manual).
- Voltage transformer (adaptation)
- Remote voltage adjustment potentiometer:
470
Ω , 0.5 W min : adjustment range ± 5% (range limited by
internal voltage potentiometer P2). Remove ST4 to connect
the potentiometer. (A 1 k
Ω potentiometer can also be used
to extend the adjustment range).
- R 731 module : detection of 200 to 500V 3-phase voltage,
compatible with parallel operation. Disconnect ST1 to
connect
the module; set the voltage via the potentiometer.
- R 734 module : detection of 3-phase current and voltage for
parallel operation on unbalanced installations (imbalance >
15%)
- R 726 module : regulation system changed to "4-function".
(See the maintenance manual and connection diagram.)
• PF regulation
ϕ (2F)
• voltage matching before paralleling (3 F)
• mains connection of alternators already running in
parallel (4F)
- R 729 module : same as R 726 with additional functions
• detection of a diode fault
• 5/20 mA input
• possibility of kVAR regulation
LAM
UN
048 or 57.5 Hz
0.87 UN
Voltage
U/f
50 or 60 Hz
fC fN
Voltage
ST5 disconnected
ST3
P2
Underspeed and LAM
UN
0
0,9
0,8
(U/f)
with
LAM Time
without LAM
1 s 2 s 3 s
Transient voltage drop
0.9
0.8
fN
Max speed drop
0
with
LAM
Time
without
LAM
1 s 2 s 3 s
01 s 2 s 3 s
Time
LAM
Variation in the load
Load on the shaft (kW)
Load shedding due to "LAM"
0Time
Drop N ≤46 Hz
U
Drop N > 46 Hz

8
INSTALLATION AND MAINTENANCE
LSA 49.1 4P
ALTERNATORS
INSTALLATION
3007 en - 11.2004 / e
LEROY-SOMER
3 - INSTALLATION
3.1 - Assembly
All mechanical handling operations must be undertaken
using approved equipment.
Whilst being handled, the machine should remain
horizontal.
3.1.1 - Handling
The generously-sized lifting rings are for handling the
alternator alone. They must not be used to lift the genset.
Choose a lifting system which respects the positioning of the
rings.
3.1.2 - Coupling
3.1.2.1 - single bearing alternator
Before coupling the two machines, check that both are
compatible by :
- undertaking a torsional analysis of the transmission on both
units
- checking the dimensions of the flywheel and its housing, the
flange, coupling discs and offset
When coupling the alternator to the prime mover, the
holes of the coupling discs should be aligned with the
flywheel holes by rotating the primary pulley on the
thermal engine.
Do not use the alternator fan to turn the rotor.
3.1.2.2 - Two-bearing alternator
- Semi-flexible coupling
Careful alignment of the machines is recommended,
checking that the concentricity and parallelism of both parts
of the coupling do not exceed 0.1 mm.
This alternator has been balanced with a 1/2 key.
3.1.3 - Location
Ensure that the ambient temperature in the room where the
alternator is placed cannot exceed 40°C for standard power
ratings (for temperatures > 40°C, apply a derating
coefficient). Fresh air, free from damp and dust, must be able
to circulate freely around the air intake grilles on the opposite
side from the coupling. It is essential to prevent not only the
recycling of hot air from the machine or engine, but also
exhaust fumes.
3.2 - Inspection prior to first use
3.2.1 - Electrical checks
Under no circumstances should an alternator, new or
otherwise, be operated if the insulation is less than 1
megohm for the stator and 100,000 ohms for the other
windings.
There are three possible methods for restoring these
minimum values.
a) Dry out the machine for 24 hours in a drying oven at a
temperature of approximately 110°C (without the AVR).
b) Blow hot air into the air intake, having made sure that the
machine is rotating with the exciter field disconnected.
c) Run in short-circuit mode (disconnect the AVR) .
- With the machine stopped, short-circuit the three output
power terminals using connections capable of supporting the
rated current (try not to exceed 6 A/mm2).
- Insert a clamp ammeter to monitor the current passing
through the short-circuit connections.
- Connect a 12 Volt battery to the exciter field terminals,
respecting the polarity, in series with a rheostat for adjusting
the resistance in order to obtain an excitation current equal to
the rated stator current (eg : 10Ω/50W),
- Open fully all the alternator openings.
- Run the alternator at its rated speed, and adjust the exciter
field current using the rheostat to obtain the rated output
current in the short-circuit connections.
Note : Prolonged standstill : In order to avoid these problems,
we recommend the use of space heaters, as well as turning
over the machine from time to time. Space heaters are only
really effective if they are working continuously while the
machine is stopped.
WARNING
WARNING
WARNING
WARNING

9
INSTALLATION AND MAINTENANCE
LSA 49.1 4P
ALTERNATORS
INSTALLATION
3007 en - 11.2004 / e
LEROY-SOMER
3.2.2 - Mechanical checks
Before starting the machine for the first time, check that :
- all fixing bolts and screws are tight
- cooling air is drawn in freely
- the protective grilles and housing are correctly in place
- the standard direction of rotation is clockwise as seen from
the shaft end (phase rotation in order 1 - 2 - 3).
For anti-clockwise rotation, swap 2 and 3.
- the winding connection corresponds to the site operating
voltage (see section 3.3)
3.3 - Terminal connection diagrams
To modify the connection, change the position of the terminal
cables. The winding code is specified on the nameplate.
3.3.1 - Standard terminal connection : 6-wire
Any intervention on the alternator terminals during
reconnection or checks should be performed with the
machine stopped.
Connection code Voltage L.L Factory connection
T3
T2
T1
T3
T2
T1
L1(U)
L2(V)
L3(W)
NDE
N
T4
T5
T6
L1(U)
L2(V)
L3(W)
NDE
NDE
NDE
T4
T5
T6
D
Star
Ph3-L3 Ph2-L2
Ph3-L3
T2-V1
Ph2-L2
Delta
Ph1-L1
T1-U1
T4-U2
T6-W2
T3-W1
T5-V2
T2-V1
Ph1-L1
T1-U1
T4-U2
T6 -W2
T3-W1
T5-V2
C
3 PH
3 PH
Winding 60 Hz50 Hz
220
230
240
220
230
240
220
240
255
6 S
8 S
R 448 voltage sensing:
0 => (T3) / 220 V => (T2)
R 448 voltage sensing:
0 => (T3) / 380 V => (T2)
Winding 60 Hz50 Hz
380
400
415
380
400
416
380
416
440
480
6 S
8 S
Optional 6-wire terminal box with connector links for mounting protection and (or) measurement C.Ts.
D
Star
Ph3-L3 Ph2-L2
Ph3-L3
T2-V1
Ph2-L2
Delta
Ph1-L1
T1-U1
T4-U2
T6-W2
T3-W1
T5-V2
T2-V1
Ph1-L1
T1-U1
T4-U2
T6 -W2
T3-W1
T5-V2
C
3 PH
3 PH
Winding 60 Hz50 Hz
220
230
240
220
230
240
220
240
255
6 S
8 S
R 448 voltage sensing:
0 => (T3) / 220 V => (T2)
R 448 voltage sensing:
0 => (T3) / 380 V => (T2)
Winding 60 Hz50 Hz
380
400
415
380
400
416
380
416
440
480
6 S
8 S
L1
L2
L3
N
T1
T2
T3
T4
T5
T6 U(1)
V(2)
W(3)
L1
L2
L3
T1
T2
T3
T4
T5
T6 U(1)
V(2)
W(3)
380
0
220
0

10
INSTALLATION AND MAINTENANCE
LSA 49.1 4P
ALTERNATORS
INSTALLATION
3007 en - 11.2004 / e
LEROY-SOMER
3.3.2 - Terminal connection : 12-wire version
Connection code Voltage L.L Factory connection
L1(U)
N
L3(W)
T1 T7
T12
T10
T4
T9
T3
T6
T11
T5
T2
T8 L2(V)
A
3 phases
3 phases
Winding 60 Hz50 Hz
190
200
208
190
200
208
208
220
230
190
208
220
240
6
7
8
N
T1
T7
T12 T10
T4
T9
T3 T6
T11 T5
T2
T8
L1(U)
L3(W) L2(V)
D
R 448 voltage sensing:
0 => (T3) / 220 V => (T2)
R 448 voltage sensing:
0 => (T3) / 220 V => (T2)
L1(U)
L2(V)
L3(W)
NDE
R 448 voltage sensing:
0 => (T3) / 380 V => (T2)
N
T9
T8
T7
T3
T2
T1
T4
T6
T10
T11
T12
T5
T3
T2
T1
T3
T2
T1
Winding 60 Hz50 Hz
380
400
415
380
400
416
415
440
460
380
416
440
480
6
7
8L1(U)
L2(V)
L3(W)
NDE
N
T9
T8
T7
T4
T6
T10
T11
T12
T5
Winding
OPTION
60 Hz50 Hz
220
230
240
220
230
240
240
255
220
240
255
6
7
8L1(U)
L2(V)
L3(W)
NDE
T9
T8
T7
T4
T6
T10
T11
T12
T5
FL1(U)
M
L3(W)
T1
T7
T12
T10
T4
T9
T3
T6
T11 T5 T2
T8 L2(V)
3 phases
LL

11
INSTALLATION AND MAINTENANCE
LSA 49.1 4P
ALTERNATORS
INSTALLATION
3007 en - 11.2004 / e
LEROY-SOMER
3.3.3 - Option connection diagram
3.3.4 - Connection checks
Electrical installations must comply with the current
legislation in force in the country of use.
Check that :
- The residual circuit-breaker conforms to legislation on
protection of personnel, in force in the country of use, and has
been correctly installed on the alternator power output as
close as possible to the alternator. (In this case, disconnect
the wire of the interference suppression module linking the
neutral).
- Any protective devices in place have not been tripped.
- If there is an external AVR, the connections between the
alternator and the cubicle are made in accordance with the
connection diagram.
- There is no short-circuit between phase or phase-neutral
between the alternator output terminals and the generator set
control cabinet (part of the circuit not protected by
circuit-breakers or cubicle relays).
- The machine should be connected with the busbar
separating the terminals as shown in the terminal connection
diagram.
3.3.5 - Electrical checks on the AVR
- Check that all connections have been made properly as
shown in the attached wiring diagram.
- Check that the ST3 frequency selection jumper is on the
correct frequency setting.
- Check whether the ST4 jumper or the remote adjustment
potentiometer have been connected.
- Optional operating modes
• ST1 jumper : disconnected to connect the R 731 3-phase
sensing module.
• ST2 jumper : disconnected if rapid response time used
• ST5 jumper : disconnected to suppress the LAM function.
• ST9 jumper : closed with AREP, open with PMG
3.4 - Commissioning
The machine can only be started up and used if the
installation is in accordance with the regulations and
instructions defined in this manual.
The machine is tested and set at the factory. When first used
with no load, make sure that the drive speed is correct and
stable (see the nameplate). On application of the load, the
machine should achieve its rated speed and voltage;
however, in the event of abnormal operation, the machine
setting can be altered (follow the adjustment procedure in
section 3.5). If the machine still operates incorrectly, the
cause of the malfunction must be located (see section 4.4).
3.5 - Settings
The only possible adjustments to the machine should be
made on the AVR.
The various adjustments during tests must be
made by a qualified engineer.
Take care that the drive speed specified on the
nameplate is reached before commencing
adjustment
1500 min-1/ 50Hz or 1800 min-1 / 60 Hz.
Do not try to set the voltage if the frequency or
speed is not correct (risk of irreparable rotor
damage).
After operational testing, replace all access panels
or covers.
R 791 T interference suppression kit
(standard for CE marking) Connection of the optional current transformer
External voltage potentiometer
or ext. source 1V (resistance 1.5 KΩ)
Black
Black
Black
Blue
White
Connections
T1 T1 T1 T1
T2 T2 T2 T2
T3 T3 T3 T3
N N
Adjusting the voltage
via a remote
potentiometer
ST4
A C D F
Neutral link
In/2 (D conn.)
Secondary 1 A 12-wire 6-wire
A / D connection
P1
P2 T10
Neutral link
In/4 (D conn.)
Secondary 1 A
D connection
P1
P2 T4
WARNING
WARNING

12
INSTALLATION AND MAINTENANCE
LSA 49.1 4P
ALTERNATORS
INSTALLATION
3007 en - 11.2004 / e
LEROY-SOMER
3.5.1 - R 448 settings
Before any intervention on the AVR, make sure that the
ST9 jumper is closed with AREP excitation and
disconnected with PMG excitation.
a) Initial potentiometer settings (see table below)
- Remote voltage adjustment potentiometer :
centre (ST4 jumper removed).
Stability adjustments in standalone operation
b) Install a D.C. analogue voltmeter (needle dial) cal. 100V on
terminals E+, E- and an A.C. voltmeter cal 300 - 500 or 1000V
on the alternator output terminals.
c) Make sure that the ST3 jumper is positioned on the desired
frequency (50 or 60 Hz).
d) Voltage potentiometer P2 at minimum, fully anti-clockwise.
e) Stability potentiometer P3 to around 1/3 of the anti-
clockwise limit.
f) Start the engine and set its speed to a frequency of 48 Hz
for 50 Hz, or 58 for 60 Hz.
g) Set the output voltage to the desired value using P2.
- Rated voltage UN for solo operation (eg. 400 V)
- Or UN + 2 to 4% for parallel operation with C.T. (eg. 410 V)
If the voltage oscillates, use P3 to make adjustments (try both
directions) observing the voltage between E+ and E- (approx.
10V D.C.). The best response times are obtained at the limit
of the instability. If no stable position can be obtained, try
disconnecting or replacing the ST2 jumper (normal/fast).
h) Check LAM operation : ST5 closed.
i) Vary the frequency (speed) around 48 or 58 Hz according
to the operating frequency, and check the change in voltage
from that observed previously (~ 15%).
j) Readjust the speed of the unit to its rated no-load value.
Adjustments in parallel operation
Before any intervention on the alternator, make sure that
the speed droop is identical for all engines.
k) Preset for parallel operation (with C.T. connected to S1,
S2)
- Potentiometer P1 (quadrature droop) in centre position.
Apply the rated load (cos Ø = 0.8 inductive).
The voltage should drop by 2 to 3%. If it increases, check that
V and W and also S1 and S2 have not been reversed.
l) The no-load voltages should be identical for all the
alternators intended to run in parallel.
- Couple the machines in parallel.
- By adjusting the speed, try to obtain 0 KW power exchange.
- By altering the voltage setting P2 on one of the machines,
try to cancel (or minimise) the current circulating between the
machines.
From now on, do not touch the voltage settings.
m) Apply the available load (the setting is only correct if a
reactive load is available)
- By altering the speed, match the KW (or divide the rated
power of the units proportionally)
- By altering the quadrature droop potentiometer P1, match or
divide the currents.
WARNING
WARNING
P2
P3
P1
P5
10 A
maximum
400V - 50 Hz
(Input
0 - 380 V)
Not set
(centre position)
Not set
(fully anti-
clockwise)
Excitation ceiling
Limit of excitation and
short-circuit current,
minimum fully anti-clockwise.
Voltage quadrature droop
(// operation with C.T.)
- 0 quadrature loop fully
anti-clockwise.
Voltage
minimum fully anti-clockwise
Stability
Action Factory setting Pot.

13
INSTALLATION AND MAINTENANCE
LSA 49.1 4P
ALTERNATORS
INSTALLATION
3007 en - 11.2004 / e
LEROY-SOMER
3.5.2 - Max. excitation setting (excitation
ceiling)
- static adjustment of the current limit , potentiometer P5 (fuse
rating : 8 A - 10 seconds).
The maximum factory setting corresponds to that of the
excitation current required to obtain a 3-phase short-circuit
current of approximately 3 IN at 50 Hz for industrial power,
unless otherwise specified(*).
A static method can be used to reduce this value or adapt the
Isc to the actual operating power (derated machine), which is
safer for the alternator and the installation.
- Disconnect power supply wires X1,X2 and Z1,Z2 and the
voltage reference (0-110V-220V-380V) on the alternator.
Connect the mains power supply using a transformer (200-
240V) as indicated (X1,X2) : 120V).
- Apply the corresponding voltage to the voltage reference
input used
- Supply the AVR with a voltage of 120V max. on the X1, X2
input.
- Install a 10A D.C. ammeter in series with the exciter field.
- Turn P5 fully anti-clockwise and activate the power supply.
If there is no output current from the AVR, turn potentiometer
P2 (voltage) clockwise until the ammeter indicates a stable
current.
- Switch the power supply off, then on again, turn P5
clockwise until the required max. current is obtained (no more
than 10 A).
Checking the internal protection :
Open switch (D) : the excitation current should increase to its
preset ceiling, remain at that level for ≥1 second in AREP or
10 seconds in PMG and then drop to < 1A.
To reset, switch off the power supply by opening switch (A).
Reconnect the AVR to the alternator and adjust the reference
voltage via P2 to obtain the rated voltage.
(*): In some countries it is a legal requirement to have a
short-circuit current, so as to offer discriminating protection.
3.5.3 - Special type of use
Excitation circuit E+, E- must not be left open when the
machine is running : AVR damage will occur.
3.5.3.1 - Field weakening
The exciter is switched off by disconnecting the AVR power
supply (1 wire on each auxiliary winding) - contact rating 16 A
- 250V A.C.
Connection is identical for resetting the AVR internal
protection.
3.5.3.2 - Field forcing
depending on the mains frequency
Max. excitation
Voltage
Field
~ 10 ohms
X2
Z1
X1
Z2
E+
E-
0V
110 V
220V
380V
50Hz 60Hz
P2
P3
P5
ST3
10A DC
100V...140V
110/220/380V
R 448
ST4
A+
-
A
D
Applications B volts Time t
Guaranteed voltage build-up 12 (1A) 1 - 2 s
Parallel operation, de-energized 12 (1A) 1 - 2 s
Parallel operation, at standstill 24 (2A) 5 - 10 s
Frequency starting 48 (4A) 5 - 10 s
Sustained voltage on overload 48 (4A) 5 - 10 s
WARNING
WARNING
AREP / PMG
X2
Z1
X1
Z2
E+
X2
Z1
X1
Z2
E+
E-
Battery (B Volt)
+
-
t
(400V - 10A)
Exciter field
~ 10 ohms
Diode
t
B Volt
Forced excitation
Time
R 448

14
INSTALLATION AND MAINTENANCE
LSA 49.1 4P
ALTERNATORS
SERVICING - MAINTENANCE
3007 en - 11.2004 / e
LEROY-SOMER
4 - SERVICING - MAINTENANCE
4.1 - Safety measures
Servicing or troubleshooting must be carried out strictly
in accordance with instructions so as to avoid the risk of
accidents and to maintain the machine in its original
state.
All such operations performed on the alternator should be
undertaken by personnel trained in the commissioning,
servicing and maintenance of electrical and mechanical
components.
Before any intervention on the machine, ensure that it cannot
be started by a manual or automatic system and that you
have understood the operating principles of the system.
4.2 - Regular maintenance
4.2.1 - Checks after start-up
After approximately 20 hours of operation, check that all fixing
screws on the machine are still tight, plus the general state of
the machine and the various electrical connections in the
installation.
4.2.2 - Cooling circuit
It is advisable to check that circulation of air is not reduced by
partial blocking of the air intake and outlet grilles : mud, fibre,
grease, etc.
4.2.3 - Bearings
The bearings are greasable. It is advisable to lubricate the
machine during operation. The lubrication characteristics are
given in the table below.
Lubrication intervals are given for grease type
LITHIUM - standard - NLGI 3.
The factory lubrication is performed with grease :
ESSO UNIREX N3.
Before using another grease, check for compatibility with the
original one. Monitor the temperature rise in the bearings,
which should not exceed 60°C above the ambient
temperature. Should this value be exceeded, the machine
must be stopped and checks carried out.
4.2.4 - Electrical servicing
Cleaning product for the windings
Do not use : trichlorethylene, perchlorethylene,
trichloroethane or any alkaline products.
Certain strictly defined pure volatile degreasing agents can
be used, such as :
- Normal petrol (without additives); inflammable
- Toluene (slightly toxic); inflammable
- Benzene (or benzine, toxic); inflammable
- Ciclohexare (non toxic); inflammable
Cleaning of the stator, rotor, exciter and diode bridge
The insulating components and the impregnation system are
not at risk of damage from solvents (see the above list of
authorised products).
Avoid letting the cleaning product run into the slots. Apply the
product with a brush, sponging frequently to avoid
accumulation in the housing. Dry the winding with a dry cloth.
Let any traces evaporate before reassembling the machine.
4.2.5 - Mechanical servicing
Cleaning the machine using water or a high-pressure
washer is strictly prohibited.
Any problems arising from such treatment are not
covered by our warranty.
The machine should be cleaned with a degreasing agent,
applied using a brush. Check that the degreasing agent will
not affect the paint.
Compressed air should used to remove any dust.
If filters have been added to the machine after manufacture
and do not have thermal protection, the service personnel
should replace the air filters periodically and systematically,
as often as necessary (every day in very dusty atmospheres).
After cleaning the alternator, it is essential to check the
winding insulation (see sections 3.2 and 4.8).
4.3 - Fault detection
If, when commissioned, the alternator does not work
normally, the source of the malfunction must be identified. To
do this, check that :
- the protective devices are fitted correctly
- the connections comply with diagrams in the manuals
supplied with the machine
- the speed of the unit is correct (see nameplate).
Repeat the operations defined in section 3.
NDE / DE bearing 6322 C3 6320 C3
Quantity of grease 60 gr or cm3 50 gr or cm3
Lubrication interval 4500 hrs of operation
WARNING
WARNING
WARNING
WARNING

15
INSTALLATION AND MAINTENANCE
LSA 49.1 4P
ALTERNATORS
SERVICING - MAINTENANCE
3007 en - 11.2004 / e
LEROY-SOMER
4.4- Mechanicaldefects
4.5 - Electrical faults
Fault Possible causes
Bearing
Excessive overheating of one or both
bearings (temperature > 80°C on the
bearing retainers with or without abnormal
noise)
- End shields incorrectly aligned (flanges not properly fitted).
- If the bearing has turned blue or if the grease has turned black, change the
bearing.
Abnormal
temperature
Excessive overheating of alternator housing
(more than 40 °C above the ambient
temperature)
- Air flow (intake-outlet) partially clogged or hot air is being recycled from
the alternator or engine
- Alternator operating at too high a voltage (> 105% of Un on load)
- Alternator overloaded
Vibration
Excessive vibration
- Misalignment (coupling)
- Defective mounting or play in coupling
- Rotor balancing fault
Excessive vibration and humming noise
coming from the machine
- Alternator operating in single-phase mode (single-phase load or faulty contactor
or installation fault)
- Stator short-circuit
Abnormal noise
Alternator damaged by a significant impact,
followed by humming and vibration
- System short-circuit
- Mis-paralleling
Possible consequences
- Broken or damaged coupling
- Broken or bent shaft end.
- Shifting and short-circuit of main field winding
- Fan fractured or coming loose on shaft
- Irreparable damage to rotating diodes or AVR.
Fault Action Effect Check/Cause
No voltage at no
load on start-up
Connect a new battery of 4
to 12 volts to terminals E-
and E+, respecting the
polarity, for 2 to 3 seconds
The alternator builds up and its voltage is
still correct when the battery is removed.
- Lack of residual magnetism
The alternator builds up but its voltage
does not reach the rated value when
the battery is removed.
- Check the connection of the voltage reference to the
AVR
- Faulty diodes
- Armature short-circuit
The alternator builds up but its voltage
disappears when the battery is
removed
- Faulty AVR
- Field windings disconnected
- Main field winding open circuit - check the resistance
Voltage too low Check the drive speed
Correct speed
Check the AVR connections (AVR may be faulty)
- Field windings short-circuited
- Rotating diodes burnt out
- Main field winding short-circuited - Check the resistance
Speed too low
Increase the drive speed
(Do not touch the AVR voltage pot. (P2) before running
at the correct speed.)
Voltage too high Adjust AVR voltage
potentiometer
Adjustment ineffective - Faulty AVR
- 1 faulty diode
Voltage
oscillations
Adjust AVR stability
potentiometer
If no effect : try normal / fast recovery
modes (ST2)
- Check the speed : possibility of cyclic irregularity
- Loose connections
- Faulty AVR
- Speed too low when on load (or LAM set too high)
Voltage correct
at no load and
too low when on
load (*)
Run at no load and check
the voltage between E+
and E- on the AVR
Voltage between E+ and E-
AREP / PMG < 10V - Check the speed (or LAM set too high)
Voltage between E+ and E-
AREP / PMG > 15V
- Faulty rotating diodes
- Short-circuit in the main field. Check the resistance
- Faulty exciter armature.
(*) Caution : For single-phase operation, check that the sensing wires coming from the AVR are correctly connected to the operating terminals
Voltage
disappears
during operation
(**)
Check the AVR, the surge
suppressor, the rotating
diodes, and replace any
defective components
The voltage does not return to the rated
value.
- Exciter winding open circuit
- Faulty exciter armature
- Faulty AVR
- Main field open circuit or short-circuited
(**) Caution : Internal protection may be activated (overload, open circuit, short-circuit)

16
INSTALLATION AND MAINTENANCE
LSA 49.1 4P
ALTERNATORS
SERVICING - MAINTENANCE
3007 en - 11.2004 / e
LEROY-SOMER
4.5.1 - Checking the winding
You can check the winding insulation by performing a high
voltage test. In this case, you must disconnect all AVR wires.
Damage caused to the AVR in such conditions is not
covered by our warranty.
4.5.2 - Checking the diode bridge
4.5.3 - Checking the windings and rotating
diodes using separate excitation
During this procedure, make sure that the alternator is
disconnected from any external load and inspect the
terminal box to check that the connections are fully
tightened.
1) Stop the unit, disconnect and isolate the AVR wires.
2) There are two ways of creating an assembly with separate
excitation.
Assembly A : Connect a 12 V battery in series with a rheostat
of approximately 50 ohms - 300 W and a diode on both exciter
field wires (5+) and (6-).
WARNING : Adapt the diode to the rated excitation
current of the alternator (see nameplate).
Assembly B : Connect a "Variac" variable power supply and
a diode bridge on both exciter field wires (5+) and (6-).
Both these systems should have characteristics which are
compatible with the machine field excitation power (see the
nameplate).
3) Run the unit at its rated speed.
4) Gradually increase the exciter field current by adjusting the
rheostat or the variac and measure the output voltages on L1
- L2 - L3, checking the excitation voltage and current at no
load and on load (see the machine nameplate or ask for the
factory test report).
When the output voltage is at its rated value and balanced
within <1% for the rated excitation level, the machine is in
good working order. The fault therefore comes from the AVR
or its associated wiring (ie. sensing, auxiliary windings).
WARNING
WARNING
DIODE BRIDGE
C
A
Anode Cathode
-C
A
+
-CA
+
A diode in good
working order must
allow the current
to flow from the anode
to the cathode.
- -
C C C
A A A
~ ~ ~
C C C
A A A
~~~
+ +
~ ~ ~
C C C
A A A
C C C
A A A
~ ~ ~
6 - 5 +
1A diode
12V battery
Rh. 50 -300W
-+
ASSEMBLY A
Field
1A diode
-
+
6 - 5 +
Variac
AC
220V
DC
12V
50
60
70
80
90
100
40
30
20
10
0
ASSEMBLY B
Field

17
INSTALLATION AND MAINTENANCE
LSA 49.1 4P
ALTERNATORS
SERVICING - MAINTENANCE
3007 en - 11.2004 / e
LEROY-SOMER
4.6 - Dismantling, reassembly (see sections
5.4.1 & 5.4.2)
During the warranty period, this operation should only be
carried out in an approved workshop or in our factory,
otherwise the warranty may be invalidated.
Whilst being handled, the machine should remain
horizontal (rotor not locked when moved).
4.6.1 - Tools required
To fully dismantle the machine, we recommend using the
tools listed below :
- 1 ratchet spanner + extension
- 1 torque wrench
- 1 set of flat spanners : 8 mm, 10 mm, 18 mm
- 1 socket set : 8, 10, 13, 16, 18, 21, 24, 30 mm
- 1 puller (U35) / (U32/350)
4.6.2 - Screw tightening torque
4.6.3 - Access to diodes
- Open the air intake grille (51).
- Disconnect the diodes.
- Disconnect the diodes using an ohmmeter or a battery lamp
(see section 4.5.2).
If the diodes are faulty :
- Remove the surge suppressor (347).
- Remove the 6 "H" mounting nuts for the diode bridges on the
support.
- Change the fitted caps, respecting the polarity.
4.6.4 - Access to connections and the
regulation system
Access directly by removing the box lid (48) or the AVR
access door (466).
4.6.5 - Replacing the NDE bearing on
machines connected to a diesel engine
- Remove the lid of the protective cover (48) and the AVR
inspection door (466).
- Disconnect the AVR.
- Take off the panels (367 and 368) and the grilles (254 and
255).
- Disconnect the stator connections (T1 to T12).
- Remove the neutral link (278).
- Take out the connector link assembly (281 + 279).
- Take out the connection plate assembly (281 + 270).
- Remove the rear cross-member (269) and the rear panel
(365).
- Remove the air intake grille (51).
- Remove the 4 bearing thrust screws (78).
- Remove all 4 screws (37).
- Take out the bearing (36).
- Remove the ball bearing (70) using a puller with a central
screw (see fig. below).
- Check the state of the "O" ring (349) and, if necessary,
change it.
- Fit the new bearing, after heating it by induction at
approximately 80°C.
REPLACE THE DISMANTLED BEARING WITH A NEW
ONE.
4.6.6 - Replacing the DE bearing
- Take out the screws (31) and (62).
- Take out the bearing (30).
- Take out the circlips (284).
- Remove the ball bearing (60) using a puller with a central
screw.
- Fit the new bearing, after heating it by induction at
approximately 80°C.
REPLACE THE DISMANTLED BEARING WITH A NEW
ONE.
IDENTIFICATION screw Ø Torque N.m
Exciter screw M6 8,3
Diode / Star bridge M 6 10
Diode nut M 6 3
Flange / Frame screw M 14 110
NDE shield / frame screw M 14 110
Discs / hub screw M 20 340
Earth screw M 12 35
Grille screws M 6 4
Cover screws M 6 5
Stator connection nut M 12 35
WARNING
WARNING
WARNING
WARNING

18
INSTALLATION AND MAINTENANCE
LSA 49.1 4P
ALTERNATORS
SERVICING - MAINTENANCE
3007 en - 11.2004 / e
LEROY-SOMER
4.6.7 - Complete dismantling
- Take out the DE bearing (30) as described in section 4.6.6.
- Support the DE rotor (4) with a strap or with a support
constructed following the drawing below.
- Remove the NDE bearing ball bearing cover.
- Knock lightly on the shaft end on the opposite side from the
coupling using a small mallet.
- Move the strap as the rotor moves in order to distribute the
weight over it.
- Remove the NDE bearing following the instructions in
section 4.6.5.
4.6.8 - Reassembling the bearings
- Place the "O" ring seal (349) and the preloading wavy
washer (79) in the bearing seat (36).
- Position on the stator (1), bearings (30) and (36).
- Tighten screws (31) and (37).
- Tilt the inner bearing retainer (78) upwards in order to
lubricate the bearing.
- Tighten the 4 HM10 screws on the inner bearing retainer (78).
- Fit the air intake grille (51).
- Replace the rear cross-member (269) and the rear panel (365).
- Replace the connection plate assembly (281 + 270).
- Replace the connector link assembly (281 + 279).
- Replace the neutral link (278).
- Connect the stator connections (T1 to T12) and the sensing wires.
- Refit the panels (367) and 368) and the grilles 254 and 255).
- Reconnect the AVR.
- Refit thelid of the protective cover (48) and the inspection
door of the AVR (466).
4.6.9 - Reassembling the rotor
On single bearing machines :
- Slide the rotor into the stator and position it as shown in fig 24.
- Tilt the inner bearing retainer (78) upwards in order to
lubricate the bearing.
- Tighten the 4 HM10 screws on the inner bearing retainer (78).
- Fit the flange and check that the machine assembly is
correctly mounted and that all screws are tightened.
On two-bearing machines :
- Slide the rotor into the stator and position it as shown in the
figure above.
- Tilt the inner bearing retainer (78) upwards in order to
lubricate the bearing.
- Tilt the inner bearing retainer (68) upwards in order to
lubricate the bearing.
- Tighten the 4 HM10 screws on the inner bearing retainer (68
and 78).
- Fit the circlips (284).
- Check that the machine assembly is correctly mounted and
that all screws are tightened.
NOTE : If the rotor has been fully rewound, it must be
rebalanced.
After operational testing, replace all access panels or
covers.
4.6.10 - Dismantling and reassembly of the filters
- Remove the grille (417) then take out the filter (418) as
shown below. Change the filter, if necessary, please refer to
section 4.2.5 for cleaning the filter. To replace follow
instructions in reverse order.
Rotor
NDE shield
Dowel
Nut
Threaded rod
4
78
36
418
417
51

19
INSTALLATION AND MAINTENANCE
LSA 49.1 4P
ALTERNATORS
SERVICING - MAINTENANCE
3007 en - 11.2004 / e
LEROY-SOMER
4.7 - Installation and maintenance of
the PMG
For the LSA 49.1, the PMG reference is : PMG 3.
4.7.1 - Mechanical characteristics and
adaptation
The components are :
- an adaptation shaft (to fit the rotor on the shaft)
- an M16 tie rod, a cable gland washer and nut for mounting
the rotor on the shaft
- a rotor with 16 magnets
- a frame+wound stator+plastic connection sheath assembly
+plastic ferrules.
- the frame end plate (4 screws CBLXS M5).
- 4 screws HM6 (for fixing the frame to the NDE shield).
If mounting in kit form, follow the following instructions.
1 - Remove the PMG cover [297] and the alternator NDE
shield bearing retainer (71).
2 - Mount the PMG frame assembly [290] on the shield using
the 4 screws HM6.
3 - Put a light coating of anti-vibration adhesive on the tie rod
[295] and screw it fully into the alternator shaft extension
tapped hole.
4 - Mount the magnetised rotor on the adaptation shaft, then
using 2 M10 threaded rods screwed into the rotor slide the
assembly onto the tie rod.
5 - Once in position, remove the 2 M10 rods.
6 - Install the cable gland washer [296].
7 - Tighten the assembly with an M16 nut.
8 - Close the PMG with the cover [297].
9 - Remove the plastic plug on the NDE panel and install the
plastic sheath and its ferrule.
10 - Connect the PMG to the AVR (see section 4.7.2).
4.7.2 - Electrical connection
- Connect the 3 PMG wires (14/15/16), to terminals X1,X2,Z2
on the AVR. Both exciter field wires (5/6) and the voltage
sensing wires (2/3) remain in place.
Electrical characteristics of the PMG 3 :
Stator phase/phase resistance 20°C : 2.1 Ω
No-load A.C. voltage between phases at 1500 rpm : 125 V.
With the PMG, check that the ST9 jumper has been
disconnected.
4.7.3 - Explosed view of the PMG
4.7.4 - Table of characteristics
Table of average values.
Alternator - 4 poles - 50 Hz - Standard winding No. 6.
(400V for the excitation values).
The voltage and current values are given for no-load
operation and operation at rated load with separate field
excitation. All values are given at ± 10% and may be changed
without prior notification (for exact values, consult the test
report).
4.7.5 - Resistances of main windings at 20°C (Ω)
Average values for 6S winding - (6 wires)
Average values for 6 winding - (12 wires)
4.7.6 - Resistance of AREP auxiliary windings
at 20°C (Ω)
4.7.7 - Field excitation current i exc (A)
4.7.8 - Voltage of auxiliary windings at no load
For 60 Hz machines, the "i exc" values are approximately 5
to 10% lower.
WARNING
WARNING
290 291 292 293 294 295 296 297
LSA 49.1 Stator L/N Rotor Field Armature
S4 0.0037 0.33 12 0.08
M6 0.0029 0.38 12 0.08
M75 0.0029 0.38 12 0.08
L9 0.0021 0.43 12 0.08
L10 0.0021 0.43 12 0.08
LSA 49.1 STATOR L/N ROTOR Field Armature
S3 0.0051 0.33 12 0.08
M5 0.0044 0.38 12 0,08
M7 0.0036 0.38 12 0.08
L9 0.0023 0.43 12 0.08
LSA 49.1 Auxil wdg : X1, X2 Auxil wdg : Z1, Z2
S4 0.23 0.34
M6 0.2 0.27
M75 0.2 0.27
L9 0.18 0.29
L10 0.18 0.29
LSA 49.1 No load At rated load
S4 0.9 3.7
M6 0.9 3.3
M75 0.9 3.6
L9 0.9 3.4
L10 0.9 3.5
LSA 49.1 X1, X2 Z1, Z2
50 Hz 90...100 V 10 V
60 Hz 108...120 V 12 V

20
INSTALLATION AND MAINTENANCE
LSA 49.1 4P
ALTERNATORS
SPARE PARTS
3007 en - 11.2004 / e
LEROY-SOMER
5 - SPARE PARTS
5.1 - First maintenance parts
Emergency repair kits are available as an option.
They contain the following items :
5.2 - Technical support service
Our technical support service will be pleased to provide any
additional information you may require.
When ordering spare parts, you should indicate the
complete machine type, its serial number and the
information given on the nameplate.
Address your enquiry to your usual contact, or to :
MOTEURS LEROY-SOMER
Usine de Sillac/Alternateurs
16015 ANGOULEME CEDEX - FRANCE
Tel. : [phone]
Technical Support Service : (33) 5.45.64.43.69
(33) 5.45.64.43.67
Fax : [phone]
Part numbers should be identified from the exploded views
and their description from the parts list.
Our extensive network of service centres can dispatch the
necessary parts without delay.
To ensure correct operation and the safety of our machines,
we recommend the use of original manufacturer spare parts.
In the event of failure to comply with this advice, the
manufacturer cannot be held responsible for any damage.
5.3 - Accessories
5.3.1 - Space heater when stopped
The space heater must run as soon as the alternator stops. It
is installed at the rear of the machine. Its standard power is
250W with 220V or 250W with 110V on request.
Caution : the power supply is present when the machine has
stopped.
5.3.2 - Temperature probes with thermistors
(PTC)
These are thermistor triplets with a positive temperature
coefficient installed in the stator winding (1 per phase). There
can be a maximum of 2 triplets in the winding (at 2 levels :
warning and trip) and 1 or 2 thermistors in the bearings.
These sensors must be linked to adapted sensing relays
(supplied optionally).
Cold resistance of cold thermistor sensors :
100 to 250 Ωper probe.
Ref. Description LSA 49.1
reference
Code
198 Voltage regulator (AVR) R 448 AEM 110 RE 005
343 Diode bridge assembly LSA
491.9.12/13
ADE 491 EQ 012
ADE 491 EQ 013
347 Surge suppressor : 250V Z 220 LP/2 PEL 250 EC 002
AVR slow-blow fuse 250V - 10A PEL 010 FA 004
Other spare parts
60 DE bearing 6322 - C3 RLT 110 OR 030
70 NDE bearing 6320 - C3 RLT 100 OR 030
418 Filter element (optional)